Glade for GTK-2.x is not available in current Debian / Ubuntu distributions (since Glade 3.10 only GTK-3.0 is supported). But we can build it from source, see here.
So, how to build Glade 3.8 for GTK 2.24 ?
git clone https://gitlab.gnome.org/GNOME/glade.git cd glade && git checkout GLADE_3_8_6 # last version for GTK-2.x ./autogen.sh ./configure make sudo make install sudo ldconfig